Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6d9e09181e336b…

MALICIOUS

PDF

87.0 KB Created: 2021-03-24 11:15:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 943fe783067ce844038f1272a736e7f6 SHA-1: 5dc82734604ac8d580aee0dce4019e9d53ef7485 SHA-256: 3d6d9e09181e336b1d02251b18bb2eb948e598704183a2791d03a4387d56ee9e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be related to search result content, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/wix?keyword=yamaha+mg16+4+manual+espa%25C3%25B1ol PDF link annotation
    • http://microbestdigitalmeter.xyz/276538585125sb9z.pdfIn PDF document text
    • http://dress-russia.ru/67301666735zab9t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_604134082df25.pdfIn PDF document text
    • http://axecheat7.xyz/zandalari_enchanting_leveling_guiderltrq.pdfIn PDF document text
    • http://jumbochecker.com/22235761618berkx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415045/normal_5ffb12183b35e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410418/normal_603e2eee87fd8.pdfIn PDF document text
    • http://profaudit32.ru/vizio_d43-c1_remotelgevq.pdfIn PDF document text
    • http://24goodstore.site/682784973879em5p.pdfIn PDF document text
    • http://reweder.site/50524007852pmi7i.pdfIn PDF document text
    • http://nyvelsets.online/viraxigagefavsr1.pdfIn PDF document text
    • http://varistop.site/canavalia_ensiformis_para_consumo_humanoflk2x.pdfIn PDF document text
    • http://legendarycraft.ru/duvituzafakuzewap9678j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/db926e29-c488-44ab-aeb1-88952f3d2583/81135556819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cffaa1f5-3d6b-4a03-a723-26cc79ec70bf/palabras_de_sanidad_en_la_biblia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4644bab3-f417-4ff8-91e4-18916829a094/35036461187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7e86a9-ee71-4d17-854e-f9517f2f3093/multiplication_times_table_chart_1-12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc1e23f1-c294-446f-a739-f6f37c511719/how_to_make_pizza_dough_if_you_dont_have_yeast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/728d468c-02f5-4ed5-b295-734b035d7fcf/why_is_research_important_in_developmental_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcd47466-33eb-4a53-90b2-a11175ea0302/92984128886.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 5360 bytes
SHA-256: 54888a1f2b0c8a81c87c2b0dffd43aa85728773f102cab0699f51d9d64d87f45
font_01_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 13552 bytes
SHA-256: bcbe18af07a691136d1571585439ccbb9c191abce5a05514b0020721be05c8a3
font_02_sfnt_off00013e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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